Typewriting-machine



A. G. F. KUROWSKIQ TYPEWRiTlNG MACHINE.

APPLICATION FILED 00L 8. 1919.

1,38 ,957, PatentedAug. 30,1921.

Aff' my UNITED STATES ggpranrorrlce.

ALFRED G. F. KUROWSKI, 0F BROOKLYNJNEW YORK, ASSIGNOR TO UNDERWOOD TYPEWRI'IER COMPANY, OF NEW YORK, N. Y., A CORPORATION OF DELAWARE.

TYrnwmrINevmomivn Specification of Letters Patent. 2 Patgnted Aug. 30, 1921.

Application filed October 8, 1919. Serial No. 829,250.

To all whom it may concern Be it known that I, A nnn G. F. KURow- SKI, a citizen of the United States, formerly a citizen of Germany, residing in Brooklyn borough, in the county of Kings, city and State of New York, have invented certain new and useful Improvements in Typewritthere is a tendency for the platen to start so rapidly that the work-sheets held against it by the usual feed rolls fail to start as soon as the platen, with the result that they are either left behind, or, in the case of a number of superposed work-sheets, some fall behind the others.

It has been found by experience that such leaving behind of the work-sheets almost never occurs when the platen is advanced by the ordinary, finger-knob. It has been assumed that the work-sheets advance with the platen when the platen is turned by the knob, because the typists fingers possess a certain elasticity which enables them to start the platen comparatively slowly and rapidly speed it up. 1 have found that if a device producing a similar or analogous elasticity is introduced between the line-space wheel and the platen, the work-sheets will advance with the platen irrespective of the speed of actuating the line-space mechanism. I have found it possible to obtain this elasticity in a comparatively simple manner by interposing rubber between the line-space wheel and the platen; and to avoid strains on the rubher and to give it sufficient adhering surface, I have found it advantageous to include the rubber as the face of a pawl which is adapted to be forcibly cammed against a driving hub of the platen at the actuation of the line-space lever, thus preventing any slipping of the rubber upon the driving hub or member. The line-space lever may be effective on the platen exclusively through.

the rubber faces of such a pawl 0r pawls,

and the line-space wheel may be fast to the platen to enable an ordinary detent to properly aline the platen after each actuation of the line-space lever. 3

In order to vary the throw of'the, platen at the line-spacing operation, the starting point of the pawls may be varied by a settable finger-piece, with the result that the line-space lever always has an identical throw.

Other features and advantages will hereinafter appear. V

In the accompanying drawings,

Figure 1 is a plan view of the left-hand end of an Underwood typewriting machine carriage embodying the present invention.

Fig. 2 is a side view of the same, some parts being broken away to enable the underlying mechanism to be readily seen.

Fig. 3 is a spread perspective of the pawls I and connected parts of the present invention, adapted to show their relationship to the rest of the mechanism. f n

Fig. 4 is a detail section showing a rivet to hold the rubber face in place upon a pawl. a v v The carriage lO comprises a shift-frame which includes an end plate 11, in which is journaledthe axle 12 of a platen 13.. For rotating the platen, there is provided the usual line-space lever 14, pivoted upon the carriage 10 at 15, and comprising the usual bell-crank extension 16, adapted to strike against a slide 17 of somewhat the usual form, and carry the slide rearwardly to effect the turning of the platen.

The slide 17, instead of the usual pawl, carries a long stout pin 18 which lies in front of an adjustable finger'piece or abutment 19, and, when carried rearwardly by the actuation of the lever 14, swings a roll carrier 20 rearwardly. This causes rolls 21 and 22 thereon to roll upon the outer cam faces 23 and 2 1 of grippingdevices shown as, pawls 25 and 26. which have inner rubber faces 27 and 28 adapted to be jammed against a hub 29 of the line-space wheel. by the rolls, with the result that when the rolls have been carried forward slightly by r at 3 1 and 32, respectively, upon opposite v sides of a pawl-carrier 33 having a central opening 34 by which it is journaled upon the axle 12.

Upon the release of the lever or handle 14, the slide 17 is drawn forwardly by a spring 35 drawingon a pin 36 thereof and attached to a lug 37 of the cover-plate 33' lVhen the slide 17 is thus drawn forward to its normal position, the pawls 25 and 26 are freed from the rolls 21 and 22, thus permitting a spring 39 drawing upon a pin 40 in the pawl-carrier 33 to swing the .pawls back to their first position, ready for a second line-spacing operation. Any irregularityin the line-spacing which may result from irregularity in the compression of the rubber is taken up by the usualspring detent 41, which is adapted to seat itself as usual in the teeth of the line-space wheel 30.

To enable the throw of the platen to be varied, the finger-piece 19 is adapted to be variably set in any one of a plurality of notches 42 in the roll-carrier 20; and, to give it the necessary strength, the lingen piece is provided with a stout lug; 43, and the notches or openings 42 are made of corresponding size.

To enable the finger-piece 1.9 to be adjusted readily, at any desired position, it is guided by the axle 12 which it embraces by an elongated slot 44, it being normally drawn into one or the other of the openings 42 by a spring 45 drawing on a pin 46 of the fingenpiece and anchored in a pin 48 at the bottom of the rollcarrier.

It is found that the rubber far-es 27 and 28 can be satisfactorily held by rivets extending through an inwardly projecting tongue 50 of the rubber surface 27 and 28 and lying within an opening of its pawl, assisted by a pin 51 projecting" from the nose of the pawl through the end of the rubber and adapted to hold the front of the rubber against slipping backwardly. The rubber coverings or faces 27 and 28 are found to work very satisfactorily if they are vulcanized quite hard on the faces which contact with the hub 29, but are comparatively soft at the back where they lie against their pawls 25 and 26. i

To arrest the line-space lever 14 and the platen 13 at the end of the line-spacing operation. there is provided a stop 5211mm supported by the pivot post 52 of the detent 41. and lyin in the path of the fingerpiece 19, thus arresting the line-space slide 17. therebyarrestinp; the platen. i

To enable the slide spring- 35 to return the roll-carrier 20 to normal position, the carrier is provided with an ear lying justin front of the pin 18 in its normal position. In order to arrest the pawl-carrier 33 when the line-space lever is in its normal unactuated position. the upper end of the lies on'a lug 55 extending outwardly from the cover plate-11, and is arrested thereby at the return of the'line-space slide. If the finger-piece 19 is in one of the left-hand notches 42, the throw of the platen is diminished by the amount of the lost motion between the pin or lug 18 and the fingerpiece 19.

, Variations may resorted to within the scope of the invention, and portions of the improvements may be used without others.

Having thus described my invention, I claim:

1. In a typewriting machine, the combinationwith a revoluble platen and a linespace lever, of an axle for the platen, a

pawl-carrier journaled on the axle. pawls, a hub on the axle, and a camming device adapted to be driven by the lever to cause the pawls to seize the huband turn. the

platen upon further actuation of the lever.

a carrier for said devices journaled upon the axle, a camming member for each device, a support for the (ramming members journaled upon the axle, and a slide adapted to be driven by the lever to drive said support to cause the devices to seize and turn the platen. I V

3. In a typewriting machine, the combination with a revoluble platen, of an axle for the platen, a pawl-carrier journaled on the axle, a friction pawl pivoted upon the carrier, a hub fast upon the axle against which the pawl may bear, a follower journaled on the axle, and a line-space lever adapted to drive sald follower tobind the pawl to the the platen, a pawl-carrier journaled on the axle. a friction pawl pivoted upon. the carrier, a hub fast upon the axle against which the pawl may bear, a follower journaled on the axle, a line-space lever adapted to drive said follower to bind the pawl tovthe hub to drive the platen, and a spring adapted to return said pawl-carrier to normal position at the return of the lever.

5. In a typewriting machine, the combination with a revoluble platen and a line-space lever, of an axle forthe platen comprising a hub, a pawl-carrier journaled upon the axle, pawls overlying said hub and pivoted. on the carrier. a. device for causingthe pawls to seize. a second carrier for said device, and a fingenpiece adapted to be variably positioned upon said'second carrier to enable the line-space lever to drive thesecond carrier to rotate the platen.

6. In a typewriting machine, the combination with a revoluble platen and a line-space a hub, a paw carrier journaled upon the axle, pawls overlying said hub and pivoted on the carrier, a device for causing the pawls to seize, a second carrier for said device, a finger-piece slidable upon said axle,

' and means for variably holding said fingerpiece upon said second carrier to enable the slide to variably drive the pawls by the finger-piece 7. In a typewriting machine, the combination with a platen having an axle of a linespace lever, a hub fast on said axle, friction deviccsadapted to variably engage said hub, cam faces upon said friction devices, a follower-carrier comprising followers adapted to ride on said cam faces to bind the devices to the hub, and means for variably driving said follower-carrier by the lever. 8. In a typewriting machine, the combination with a platen having an axle, of a linespace lever, a hub fast on said axle, friction devices adapted to variably engage said hub, cam faces upon said friction devices, a follower carrier comprising followers adapted to ride on said cam faces to bind the devices to the hub, an abutment adjustable on said follower carrier, a slide driven by said lever, and a post pon said slideadapted to engage said abutment to drive the carrier.

9. In a. typewriting machine, the combination with a platen having an axle, of a linespace lever, a hub fast on said axle, friction devices adapted to variably engage said hub, cam faces uponsaid friction devices, a follower carrier comprising followers adapted to ride on said cam faces to bind the devices to the hub, a finger-piece shiftable upon said axle and adapted to be variably positioned in openings in said carrier, a slide driven by said lever, and a post upon said slide adapted to engage said finger-piece to variably drive the carrier thereby. I

10. In a typewriting machine, the combination with a platen having an axle and a hub, of a line-space lever, friction devices adapted to engage said hub, a carrier for said friction devices, a lug against which said. carrier normally rests, cam faces upon said devices, and a follower device adapted to be variably driven by said lever to engage said friction devices and variably turn the platen.

11. In a typewriting machine, the combination with a platen having an axle and a hub, of a line-space lever, friction devices adapted to engage said hub, a carrier for said friction devices, a lug against which said carrier normally rests, cam faces upon said devices, a follower carrier upon said axle, followers on said follower carrier adapted to ride on said cam faces to bind the devices to the hub, an adjustable abutment upon said follower carrier, and means for driving the follower carrier by the abutment from the line-space lever.

12. In a typewriting machine, the combination with a revoluble platenjand an axle therefor, of a hub, a line-space lever, and

rubber interposed between the lever and the hub and in bearing en a ement with said hub.

13. In typewriting machine, the (LOIIlbl-' nation with a revoluble platen and an axle therefor, of a hub, a line-space lover, a pair of rubber faced pawls, and a connection op-' erated by the lever to cause said pawls to grip the hub and turn the platen.

14. In a typewriting machine, the combination with a revoluble platen and an axle therefor, of a hub, a line-space lever, a pair of pawls, a rubber face on each pawl, a tongue on each face lying within the pawl, a cam face upon the backs of the'pawl, and a follower device driven by the lever to seize said cam faces to cause the rubber faces to grip the hub and turn the platen.

15. In a line-space device, the combination with a hub, of a rubber faced device to seize said hub, a rubber tongue extending within an opening in said device to hold it to the device, and a rubber nose extending from the rubber surface over the nose of the device to hold the rubber surface.

16. In a line-space device-,'the combination with a hub, of a rubber faced device for seizing the hub, the rubber being vulcanized harder upon the bearing face and softer within.

17. In a line-space device, the combination with a slide, of a platen axle, a seizing device journaled on the axle independently of said slide, and a finger-piece adjustable on the device to vary the throw of the platen axle.

18. In a linespace device, the combination with a slide, of a platen axle, a seizing device journaled on the axle, an abutment adjustable upon the device, and a projection on the slide adapted to drive the axle by said abutment.

19. In a line-space device, the combina-' tion with a platen hub, of pawls adapted to seize said hub, an axle, a pawl-carrier j ournaled on the axle adjacent the hub so the pawls overlie the hub, and a pawl gripper j'ournaled on the axle adjacent the carrier adapted to grip the pawls against the hub and turn the hub thereby. 1

20. In a line-space device, the combination with a platen hub, of gripping devices, a carrier for said devices, a follower carrier adapted to ride upon said devices to lock them to the hub, and a lever adapted to drive the follower to effect the locking and then turn the hub.

21. In a line-space device, the combination with a platen hub, of rubber faced grip- I ping devices, a carrier for said devices, a follower carrier adapted to ride upon said devices to lock them to the hub, and a lever adapted to drive the follower to effect the locking and then turn the hub.

22. In a line-space device, the combination with a platen hub, of gripping devices, a carrier for said devices, a follower carrier adapted to ride upon said devices to lock them to the hub, a lever adapted to drive the follower to effect the locking and then turn the hub, and means for returning said lever and said devices to their starting point to effect a second turning of thehub.

23. Ina typewriting machine, the cornbination with a revoluble platen and an axle therefor, of a hub, a line-space lever, rubber interposed between the lever and the hub, a detent for holding the platen, and a non-V resilient connection between the detent and the platen.

24:. In a typewriting machine, the combination with a revoluble platen and a linespace lever, of an axle for the platen, a pawlcarrier journaled on the axle, pawls, a hub on the axle, a camming device adapted to be driven by the lever to cause the pawls to seize the hub and turn the platen upon further actuation of the lever, and a spring detent for alining the platen.

25. In a typewriting machine, the combination with a revoluble platen and a linespace lever, of an axle for the platen, a hub on the axle, seizing devices adjacent the hub, a carrier for said devices journaled upon the axle, a camming member for each de vice, a support for the camming members journaled upon the axle, a slide adapted to be driven by the lever to drive said support to cause the devices to seize and turn the platen, and a spring detent' for alining the platen.

26. In a typewriting machine, the combination with a platen having an axle, of a line-space lever, a hub fast on said axle, friction devices adapted to variably engage said hub, cam faces upon said friction devices, a follower carrier comprising followers adapted to ride on said cam faces, to bind the devices to the hub, means for variably driving said follower carrier by the lever, and a spring detent for alining the platen.

27. In a typewriting machine, the com bination with a platen having an axle and a hub, of aline-space lever, friction devices adapted to engage said hub, a carrier for said friction devices, a lug against which said carrier normally rests, cam faces upon said devices, a follower device adapted to be variably driven by said lever to variably turn the platen, and a spring detent for alining the platen.

ALFRED G. F. KUROWSKI. /Vitnesses:

CATHERINE A. NEWELL, JENNIE P. THORNE'. 

